Representative image of the series — dimensions and configuration of this model are given in the drawing and data table below.

ImpellerØ630 mm24.8 in
Max airflow17,955 m³/h10,688 CFM
Max static pressure956 Pa3.84 in. wg
Voltage380 V
Speed1,210 rpm
Input power3,320 W4.45 hp
Noise86.9 dB(A)

LWBA4D630-188NT-03 AC Backward Curved Centrifugal Fan Ø630 mm

Ø630 mm | AC | Max airflow 17,955 m³/h | Max static pressure 956 Pa | 86.9 dB(A)

SKU: LWBA4D630-188NT-03 Categories: Backward Curved Centrifugal Fans, Centrifugal Fans

Direct from LONGWELL
OEM / ODM
Samples in 1–3 days
Production 15–30 days
12-month warranty
CE · RoHS · ETL on request

PDFDatasheet (PDF)electrical & performance dataPDFFull product catalogueAC AC Backward centrifugal fans · SKU on PDF p. 40

All files for LWBA4D630-188NT-035 files · direct download

PDFFull product catalogue · model on PDF p. 40 WEBPDimensional drawing WEBPPerformance curve WEBPWiring diagram

CAD models (STEP / DWG) are released on request — see “Engineering files” below. Another format or a non-standard variant? Ask an engineer · download center

Used in

Air conditioning Air handling units FanGrid arrays FFU / EFU All industries →

Proven in projects

AHU & ventilation unit fans CRAH FanGrid retrofit Heat pump fan programme All case studies →

Engineering files (on request)

CAD files exist for this model and can be released for assembly checks in SolidWorks / CATIA / Creo / Inventor.

CAD models contain the blade geometry and are not publicly downloadable. Tell us the project; an engineer sends the file after a short check, normally within 1 business day.

Get a quote · LWBA4D630-188NT-03

Price, curve check and lead time within 1 business day.

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WhatsApp / Phone+86 183 5827 4663 E-mail an engineersales@longwellfans.com Files for LWBA4D630-188NT-03datasheet · catalogue · drawings · curves — listed above

Samples 1–3 days · fee credited to your order
Typically 50–200 pcs · ~30 pcs for a first validation order
T/T 30 / 70 · FOB / CIF / DDP
Released to LONGWELL standards · 12-month warranty
How ordering works →

Performance curve (P-Q) LWBA4D630-188NT-03

Required airflow Required static pressure

Digitised from the catalogue curve at standard air (20 °C, 101.3 kPa, 1.2 kg/m³); one curve per voltage / speed grade (1 here, rated 380 V). Data version: catalogue curve re-digitised 2026-09-20 (axis-calibrated, cross-checked). The system resistance curve depends on the actual ductwork — confirm the operating point on site. Need an engineer to verify the duty point? Contact us or add the model to your RFQ and note the duty point.

Drawing, Curve & Wiring LWBA4D630-188NT-03

LWBA4D630-188NT-03 Dimensional drawing — **Dimensional drawing**Dimensions in mm. Confirm against the final approval drawing before machining cut-outs.

LWBA4D630-188NT-03 Performance curve (P-Q) — **Performance curve (P-Q)**Static pressure vs. airflow. Curve numbers correspond to supply voltage / speed grades.

LWBA4D630-188NT-03 Wiring diagram — **Wiring diagram**Lead colours and terminal assignment; TK = motor thermal contact.

Files for LWBA4D630-188NT-03: datasheet, catalogue and drawing PDFs are listed above ↑ · CAD (STEP / DWG) on request — ask an engineer.

Technical description LWBA4D630-188NT-03

LWBA4D630-188NT-03 is a LONGWELL AC Backward Curved Centrifugal Fan from the Backward Curved Centrifugal Fans range, impeller Ø630 mm, rated 380 V AC, maximum airflow 17,955 m³/h, maximum static pressure 956 Pa, noise 86.9 dB(A), input power 3,320 W. The fixed-speed AC external-rotor motor is simple, robust and cost-effective for constant-duty applications.

Technical data

Model	LWBA4D630-188NT-03
Series	LWBA4D630
Motor type	AC
Phase	3-phase
Rated voltage	380 V
Frequency	50 Hz
Current	5.87 A
Input power	3,320 W
Speed	1,210 rpm
Max. airflow	17,955 m³/h
Max. airflow (CFM)	10,688 CFM
Max. static pressure	956 Pa
Noise	86.9 dB(A)
Ambient temperature	-40 ~ 65 °C
Storage temperature	-30 ~ 70℃
Humidity	0 ~ 85 % RH
Altitude	< 1000m
Impeller diameter	Ø630 mm
Rotor diameter	188 mm
Impeller material	Aluminum Alloy
Protection class	IP54
Insulation class	F
Bearing	Maintenance-free ball bearings
Duty	S1
Vibration standard	JB/T 8689
Service life	40,000Hours(L10), At 40 °Croom, humidity 15%~65%RH. Balancing According to JB/T 9101-1999 requirements G6.3 Vibration of the fan Test method accord with JB/T 8689 Installation method Horizontal or vertical installation Mate
Rotation	Clockwise,seen on rotor

Typical applications

Air handling units (AHU) and rooftop units (RTU)
Data-center CRAH / CRAC units and fan walls
Dust extraction and process ventilation
Fan filter units and air purifiers

Series LWBA4D630: models in the same series share the impeller and motor platform and differ in speed grade, voltage or lead-out / terminal-box configuration — compare them in the table below or ask for the best fit at your duty point.

Nameplate values: maximum airflow is measured at zero static pressure and maximum static pressure at zero airflow; the two never occur together. Confirm the operating point on the performance curve. Final selection is subject to the duty point (airflow / static pressure / voltage / control mode) and project verification.

Company certificates

Scans of original documents held by Ningbo Longwell Electric Technology Co., Ltd.: the company ISO 9001 / 14001 / 45001 management-system certificate. Click a scan to open the original.

ISO 9001 / 14001 / 45001Management systems of Ningbo Longwell Electric Technology Co., Ltd. (company certificate).

ISO 9001 / 14001 / 45001 management system certificate — LONGWELL certificate

PDFISO 9001 / 14001 / 45001 management system certificate

Need a Declaration of Conformity for this model and your destination market? Ask us — we arrange additional certification on request.

How to order LWBA4D630-188NT-03

Most first orders follow the same eight steps. Quantities, terms and lead times are confirmed in your quotation.

1SelectFind models by duty point in the selector or by model number, compare on the curve and add them to your RFQ list.
2Engineering checkWithin 1 business day you receive the duty-point check on the curve, price and lead time.
3SamplesStock models ship in 1–3 days.
4Validation supportDatasheets, drawings, wiring diagrams and DoC per model; test reports, CAD and register maps after a short project check or NDA.
5Order & paymentProforma invoice; first orders on T/T 30 / 70.
6Production & release15–30 days at the partner factory that builds your model, then inspected and released to LONGWELL standards with outgoing sampling to AQL 2.5.
7ShippingFOB / CIF / DDP by sea from Ningbo or Shanghai; express and air on EXW / FCA / DAP.
8After-sales12 months standard, extendable to 18–24 months by project agreement; test records retained for 5 years; 8D closed-loop for any issue; annual technical review for framework customers.

See terms, QC and FAQ →

Test & release at LONGWELL

Specified and drawn by LONGWELL; built to LONGWELL drawings by qualified partner factories; inspected and released to LONGWELL standards before shipment.

See test and release photos (8)

LONGWELL Semi-anechoic chamber — Semi-anechoic chamber

LONGWELL Test laboratory — Test laboratory

Test labs and all certificate scans →

Alternatives with the same impeller (Ø630 mm · AC)

Same impeller, different speed grade, power or wiring. Step up for more airflow, step down for lower noise.

Model	Max airflow	Max static pressure	Speed	Power	Noise	Voltage
LWBA4D630-188NT-03 this model	17,955 m³/h	956 Pa	1,210 rpm	3,320 W	86.9 dB(A)	380 V
LWBA8D630-188NT-02	9,270 m³/h	288 Pa	700 rpm	700 W	72 dB(A)	380 V	View
LWBA6D630-188NT-01	12,360 m³/h	494 Pa	900 rpm	1,500 W	80 dB(A)	380 V	View